1. Agency for Toxic Substances and Disease Registry (ATSDR) 1999a. Toxicological Profile for Mercury. US Department of Health and Human Services, Public Health Service: Atlanta, GA.
2. Agency for Toxic Substances and Disease Registry (ATSDR) 1999b. Toxicological Profile for Cadmium. US Department of Health and Human Services, Public Health Service: Atlanta, GA.
3. Agency for Toxic Substances and Disease Registry (ATSDR) 1999c. Toxicological Profile for Lead. US Department of Health and Human Services, Public Health Service: Atlanta, GA.
4. Agency for Toxic Substances and Disease Registry (ATSDR) 2000a. Toxicological Profile for Manganese. US Department of Health and Human Services, Public Health Service: Atlanta, GA.
5. Agency for Toxic Substances and Disease Registry (ATSDR) 2000b. Toxicological Profile for Chromium: Update. US Department of Health and Human Services, Public Health Service: Atlanta, GA.